|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhombifera - Pleurocystitidae
It was assigned to Pleurocystitidae by Sprinkle (1974); to Rhombifera by Sepkoski (2002); and to Deltacystinae by Sumrall and Sprinkle (1995) and Nardin and Bohatý (2013).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|J. Sprinkle 1974||Large pleurocystitid cystoids having a flattened triangular calyx with a strongly asymmetrical profile. Plating irregu- lar; BB, ILL, and LL circlets well developed, but RR and 00 circlets reduced. Size of peri- proct and ventral plating poorly known, but many small periproctals apparently present. Two strongly compressed conjunct rhombs (B2/IL2 and L3/L4) present on dorsal sur- face bearing as many as 130 apparently discrete dichopores. Two long biserial brachioles attached to summit beside central mouth with brachiolar food groove running along inside dorsal surface. Enlarged proximal stem con- tains ridged outer colum|